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Supplementary Heat

Auxiliary or emergency heat, usually electrical resistance heat, provided at temperatures below a heat pump’s balance point.

Split System

The most common type of home central air conditioner, it consists of a compressor (the unit and condenser, installed outside the building) and a non-compressor (the air-handling unit installed within the building).

Single Package

A year-round heating and air conditioning system with all components encased in one unit outside the home.


The temperature at which a thermostat is set for desired comfort level.

Sensible Heat

Heat energy that raises or lowers the temperature of a gas, liquid or solid when added or removed from that material.

Sensible Cooling Capacity

An air conditioning system’s capability to reduce the temperature by removing heat from the air.

Seasonal Energy Efficiency Ratio (SEER)

A rating that denotes the efficiency of air conditioning equipment in terms of the amount of cooling your equipment delivers for every dollar spent on electricity. The higher the SEER, the more efficient the unit and the lower the operating cost.